Extensible bookrack



- '1. A. KRIVAC'S.

' EXTENSIBLE BOOKRACK. v- .APPLICATION FILED SEPT-81 192i.

' Patented May 9,1922.

38y a361: /NVENT0 WWI/ 7 I ATTORNEY JOSEPH A. KRIVACS, OF MOUNT VERNON,NEW YORK.

, EXTENSIBLE BOOKRAGK,

Specification of Letters Patent.

Patented May 9, 192 2.

Application filed. September 8, 1921. Serial No. 499,314.

To all whom concern:

Be it known that I, JosnPH A. KRIvAos, a citizen of theUnited States,residing at the village of Mount Vernon, county of Westchester, State ofNew York, have invented an Improved Extensible Bookrack, of which thefollowing is a specification.

My invention relates generally to book racks.

Among otherobjects of my invention is to provide a convenient, and neatbook rack of a pleasingdesign to support a book while being read, withmeans for collapsing the frame when not in use.

For this and other purposes I provide an extensible book rack comprisinga carriage or support for the book, this is carried by a pair ofextensible lever arms. The rack is detachably mounted on a pivotalbearing adapted to be clamped to a chair arm and the other end of therack may be provided with a spring clutch to engage the other arm of thechair.

I thus provide by a novel construction and arrangement of parts, a bookrest or carriage which is collapsible and dismountable, occupying butlittle space when not in use, easily portable and light and durable.

Having thus generally described some of the objects and general featuresof my invention I will now particularly describe the same bv referenceto the annexed drawing in which similar reference characters indicateidentical parts.

In the drawing Figure 1 is a front view of a structure embodying myinvention and Figure 2 1s a side view of'the same showing the clutchbearing engaged with a chair arm.

In the drawing the pivotal bearing 1, is shown as a clamp adapted toengage a chair arm comprising arms 2 and 3 secured by a screw bolt & andnut 5, at'the free end and pivoted on the bolt 6 at the other.

The arm 2 is pierced to receive a pivot 7 as shown. The vertical arm 8having the pivot 7 at its lower end has pivotally mounted thereon thelinks of one mate of the pair of extensible lever arms 9, 9 Pivotallyattached to the other end of the arm 9 is a book rest or carriage 10,and in like manner the end links of the arm 9 are pivotally attached tothe opposite part of the book rest or carriage 10. The outer links ofthe arm 9* are pivotally attached to a vertical arm 11 which is providedat its lower end with a spring grip or clamp 12 adapted to engage theother chair arm.

I do not confine myself to any specific form of clamp or grip butinclude any form which may be adapted for the purpose and instead of aclamp or grip the rack may be pivotally mounted on one or more standsThe or bases to rest on a shelf or table.

book rest or carriage 10 is provided with an adjustable ratchet arm 13.This is an angle arm having a lip on which the bottom of the 1conveniently removed by lifting the pivot out of engagement.

Having thus shown specified and described the same I claim as novel andmy invention:

1. A book rack comprising in combination a pair of extensible leverarms. a book rest to which the lever arms are severally pivotallysecured on opposite sides, twovertical arms to which the opposite endsof the lever arms are respectively secured, a pivotal bear-' ing adaptedtozcarry one vertical arm and Y a grip carried by the other verticalarm.

2. A book rack'comprising in combination,

apair of extensible lever arms, a book rest to which the lever arms areseverally pivotally secured on opposite sides. two vertical.

arms to which the opposite ends of the lever arms are respectivelysecured, a pivotal bearing adapted to carry one vertical arm and asupport for the other vertical arm.

Signed at New York in the county of New York and State of New York'this1st day of September, A. D. 1921.

JOSEPH A. KRIvAos,

